21136918248 has 80 divisors (see below), whose sum is σ = 59483909760. Its totient is φ = 7012202400.

The previous prime is 21136918247. The next prime is 21136918267. The reversal of 21136918248 is 84281963112.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21136918247) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 59433 + ... + 214023.

It is an arithmetic number, because the mean of its divisors is an integer number (743548872).

Almost surely, 2^21136918248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21136918248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29741954880).

21136918248 is an abundant number, since it is smaller than the sum of its proper divisors (38346991512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21136918248 is a wasteful number, since it uses less digits than its factorization.

21136918248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154820 (or 154807 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The spelling of 21136918248 in words is "twenty-one billion, one hundred thirty-six million, nine hundred eighteen thousand, two hundred forty-eight".